XAFS Characterization of Active Fe Species in Fe<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> Catalyst for Styrene Dimerization

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  • YAMAMOTO Takashi
    Institute of Socio-Arts and Science, The University of Tokushima
  • KIKUCHI Makoto
    Institute of Socio Techno Sciences, The University of Tokushima Graduate School
  • OKADA Saki
    Department of Mathematical and Material Science, Faculty of Integrated Arts and Sciences, The University of Tokushima
  • YAMASHITA Kazuhide
    Department of Mathematical and Material Science, Faculty of Integrated Arts and Sciences, The University of Tokushima
  • SADA Chisa
    Department of Mathematical and Material Science, Faculty of Integrated Arts and Sciences, The University of Tokushima
  • IMAI Shoji
    Institute of Socio-Arts and Science, The University of Tokushima
  • MIYOSHI Norikazu
    Institute of Socio-Arts and Science, The University of Tokushima
  • WADA Makoto
    Department of Mathematical and Material Science, Faculty of Integrated Arts and Sciences, The University of Tokushima

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Other Title
  • スチレン類二量化に有効な鉄シリカ触媒のXAFS法による構造解析
  • スチレンルイ ニリョウカ ニ ユウコウ ナ テツ シリカ ショクバイ ノ XAFSホウ ニ ヨル コウゾウ カイセキ

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<p>Iron ion-promoted silica solid acid catalysts active for α-methylstyrene dimerization were characterized by XRD and Fe K-edge XANES/EXAFS spectroscopic techniques. The possible active species were proposed. The 1 mol % of iron to Si was incorporated in catalyst samples, which was prepared by sol-gel process using iron chloride and tetraethylorthsilicate (TEOS) as the sources. The incorporated trivalent iron species were characterized as tetrahedral FeOxCl4-x, and excess loaded species were aggregated to form α-Fe2O3 during drying process at 403 K. The fraction of [FeOxCl4-x], [FeCl6] and [FeO6] species in the catalyst samples were determined by the least-squares analysis of XANES.</p>

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